Researcher Database

KURUMISAWA Kiyofumi
Faculty of Engineering Sustainable Resources Engineering Resources Engineering
Associate Professor

Researcher Profile and Settings

Affiliation

  • Faculty of Engineering Sustainable Resources Engineering Resources Engineering

Job Title

    Associate Professor

Degree

  • Doctor of Engineering, Tokyo Institute of Technology

URL

Research Interests

  • NMR   cement   concrete   microstructure   durability   

Research Areas

  • Architecture and building engineering / Building structures/Materials
  • Architecture and building engineering / Building structures/materials

Academic & Professional Experience

  • 2005    - Researcher

Education

  •        - 2003  Tokyo Institute of Technology  Graduate School, Division of Integrated Science and Engineering  japan

Association Memberships

  • JAPAN CONCRETE INSTITUTE   

Research Activities

Published Papers

  • Ben Li, Lalita Baingam, Kiyofumi Kurumisawa, Toyoharu Nawa, Liu XiaoZhou
    Construction and Building Materials 164 554 - 569 09500618 2018/03 [Refereed][Not invited]
     
    © 2018 Elsevier Ltd The alkali-silica reaction causes long-term degradation of microstructure of cement paste and aggregate, and as results in macroscopic expansion. In this paper, a micro-mechanical expansion model was developed coupling with the damage and thermodynamic theory. First of mortar thermal coefficients were estimating to determine the true expansion due to ASR based on EPMA and MIP results and expansion proposed in this paper were compared with analysis results of Suwito's and Multon's model. The results indicate that the increasing of temperature conducted reduced fluctuations of ASR expansion coefficient of cement paste. In addition, our proposed model accurately reproduces the true-dependency of expansion due to ASR with the lowest error. Overall, the proposed microscopic expansion model is able to apply for numerical analyse of deteriorated due to ASR concrete structure designs with in the deterioration of ASR in the future.
  • Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Bijan Samali, Toshifumi Igarashi
    Journal of Cleaner Production 166 1507 - 1520 09596526 2017/11 [Refereed][Not invited]
     
    © 2017 Elsevier Ltd This study evaluates the effects of high percentages of different by-products, including blast furnace slag (BFS) and fly ash (FA), on the structural performance, energy requirement and environment impacts of a concrete heavy-duty pavement (HDP) at various curing temperatures. The results of the structural performance indicate that HDP containing up to 70% BFS and HDP containing 30% FA can be comparable in controlling the HDPs designed for highways and airports. Moreover, the results of the environmental impact assessment indicate that the synergy of the by-product and warm water can reduce the energy requirement and CO 2 footprint by 5.77%–56.54% and 8.16%–55.5% for the highway and airport HDPs, respectively. Although the elevated curing temperature improves the structural performance and sustainability of the concrete pavements, any delay in concrete production increases energy consumption accordingly. Moreover, a new parameter (∇ TE ), which is the time gradient per unit energy consumption developed based on the Laplace transformation, is proposed to characterize the effect of the time delay in concrete production. This parameter indicates that the time required for a unit energy consumption (1 TJ) decreases by 50%, as the curing temperature increases. In conclusion, analysis of the structural design, carbon footprint, and the results of ∇ TE indicate that 35 °C can be proposed as the optimum water curing temperature for the HDP incorporating by-products.
  • Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Mao Jize, Gregory White
    Journal of Cleaner Production 164 367 - 388 09596526 2017/10 [Refereed][Not invited]
     
    © 2017 Elsevier Ltd Pavements are one of the most energy-intensive infrastructure assets that depend on non-renewable natural resources. Against the background of restrictions on landfill disposal, the increased use of alternative materials such as industrial byproducts in pavement construction has gained great attention from academic and industrial sectors. However, comprehensive research covering various aspects of pavements incorporating different byproducts is lacking. The main purpose of this state-of-the-art study is to bridge this gap via the analysis of the performance of pavements incorporating two types of byproducts, blast furnace slag, and fly ash, from the perspectives of structural performance, energy saving potential, and greenhouse gas emission reduction at various phases of pavement life. Therefore, the contents of 150 published documents, including research papers, theses, and academic and industrial reports published over a span of 49 years (1968–2017) were analyzed. The major findings indicated that incorporation of the byproducts may have positive or negative consequences in various phases of pavement life. However, the new pavements are advantageous from the viewpoint of raw material processing because of low consumption of raw materials and pertinent environmental footprints. In addition, several scenarios are proposed for ranking the alternative materials on the basis of the technical and environmental requirements for a paving project; these scenarios can be useful for the preliminary selection of alternative materials. Finally, some gaps are highlighted for future research.
  • Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Jize Mao, Ben Li
    Journal of Traffic and Transportation Engineering (English Edition) 4 (2) 118 - 130 20957564 2017/01 [Refereed][Not invited]
     
    © 2017 The Authors.In this study, the effects of the thermal properties of asphalt binders and aggregate materials were characterized in terms of the specific heat capacity (C) for energy consumption and environmental footprints of hot mix asphalt (HMA) and warm mix asphalt (WMA). Asphalt mixes produced using low-C aggregate are found to be more energy-efficient and environmental friendly, irrespective of the binder type and construction technology. Therefore, different fractions of aggregate blends were replaced with the aggregate provided from a low-C source or sustainable source. Analysis of energy consumption clearly indicated that the specific energy and environmental footprints decrease linearly as the low-C aggregate content increases. The amount of energy saving realized in the asphalt industries by the use of low-C aggregate is significant on a national scale in China. In this regard, China was chosen as a case study. Analysis of fuel requirement clearly indicated that the production of WMA using high thermal sensitivity aggregate can yield significant energy saving sufficient to fuel 44,007 to 664,880 Chinese households per year. Therefore, use of low C aggregate in asphalt mix production can be adopted as a strategy to produce WMA and HMA.
  • Hatanaka Akira, Elakneswaran Yogarajah, Kurumisawa Kiyofumi, Nawa Toyoharu
    Journal of Advanced Concrete Technology Journal of Advanced Concrete Technology 15 (8) 426 - 439 1346-8014 2017/08 [Refereed][Not invited]
     

    The purpose of this study is to determine the tortuosity of cementitious materials containing blast furnace slag (BFS). Furthermore, the influence of tortuosity on multi-species transport into these materials is studied. The porosity and diffusivity of calcium silicate hydrate (C-S-H) were predicted using a three-dimensional spatial distribution model, which were then fitted to Archie's law to determine tortuosity. The tortuosity increased with the slag replacement ratio, suggesting that the diffusion path for ions becomes complicated and lengthy due to slag addition. Thermoporometry was used to determine the pore size distribution of hydrated slag-blended cement. A partial replacement of ordinary Portland cement (OPC) with BFS modified the mineralogy (especially in the types of C-S-H), resulting in changes to the pore structure. The determined tortuosity and porosity were used in a reactive transport model to predict multi-species transport. Experimentally measured and simulated chloride profiles were in good agreement for hydrated OPC and slag-blended cements exposed to sodium chloride solutions. The causes for the low penetration rate of chloride in slag-blended cementitious materials are discussed considering their pore structure and surface electrical properties. The role of tortuosity on Cl-/OH- for the evaluation of chloride induced corrosion was also discussed.

  • Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Toshifumi Igarashi
    Renewable and Sustainable Energy Reviews 64 211 - 236 13640321 2016/10 [Not refereed][Not invited]
     
    © 2016 Elsevier Ltd.This paper discusses the engineering properties of waste glass (WG), including its structural and environmental performance, as an alternative material for the construction of various types of paving systems, including asphalt, concrete, and block pavements. As a first step, an overview of the asphalt, cement, and glass manufacturing industries is provided. Then, a large volume of data is analyzed from various sources in the literature. Particular emphasis is given to laboratory studies of the structural performance and durability of WG. Additionally, the effect of WG on the field performance of the pavements is discussed. The sustainability of the pavements is also evaluated in terms of energy consumption, greenhouse gas emissions, safety, and the heat island phenomenon. In conclusion, the use of WG can improve various phases of pavement life and structure by enhancing the structural performance, durability, environmental friendliness, and aesthetic features of pavements.
  • Kiyofumi Kurumisawa, Kazuko Haga, Daisuke Hayashi, Hitoshi Owada
    Physics and Chemistry of the Earth 99 175 - 183 14747065 2016/08 [Refereed][Not invited]
     
    © 2017 Elsevier Ltd.It is very important to predict alterations in the concrete used for fabricating disposal containers for radioactive waste. Therefore, it is necessary to understand the alteration of cementitious materials caused by calcium leaching when they are in contact with ground water in the long term. To evaluate the long-term transport characteristics of cementitious materials, the microstructural behavior of these materials should be considered. However, many predictive models of transport characteristics focus on the pore structure, while only few such models consider both, the spatial distribution of calcium silicate hydrate (C-S-H), portlandite, and the pore spaces. This study focused on the spatial distribution of these cement phases. The auto-correlation function of each phase of cementitious materials was calculated from two-dimensional backscattered electron imaging, and the three-dimensional spatial image of the cementitious material was produced using these auto-correlation functions. An attempt was made to estimate the diffusion coefficient of chloride from the three-dimensional spatial image. The estimated diffusion coefficient of the altered sample from the three-dimensional spatial image was found to be comparable to the measured value. This demonstrated that it is possible to predict the diffusion coefficient of the altered cement paste by using the proposed model.
  • Ali Jamshidi, Meor Othman Hamzah, Kiyofumi Kurumisawa, Toyoharu Nawa, Bijan Samali
    Materials and Design 95 9 - 20 02641275 2016/04 [Refereed][Not invited]
     
    © 2016 Elsevier Ltd.There are many technologies to produce sustainable asphalt pavements that may affect various phases of pavement life. Therefore, it is difficult to choose the most appropriate technology that addresses all the engineering requirements, especially in the technologies produce the identical outputs. In this study, a PG64 asphalt binder (base binder) was upgraded to PG70 (target binder) through incorporation of two different sustainable approaches: (1) synthetic wax and (2) recovered binder from reclaimed asphalt pavement (RAP). The effects of the different modification methods were evaluated in terms of the engineering properties of materials and the sustainability features of mix production. The results indicated the modified binder (as outputs) have the same performance grade as the target binder, but the incorporation of RAP reduces the environmental pollutants at the stage of raw material processing, while the use of the wax decreases the pollutants during asphalt mix production. Consequently, the selection of the type of sustainable technology for production of cleaner asphalt pavement depends significantly on the stage desired to be modified in the pavement construction. A few scenarios and a new method are also proposed as a guide to selection of the appropriate sustainable approaches based on the binder and engineering properties.
  • Kurumisawa Kiyofumi, Nawa Toyoharu
    Journal of Advanced Concrete Technology Journal of Advanced Concrete Technology 14 (3) 87 - 94 1346-8014 2016/03 [Refereed][Not invited]
     
    The transport properties of hardened cement paste (HCP) have been investigated in many studies; the AC impedance method (ACI) is a non-destructive technique employed for this purpose and has been used in investigations of the elec-trical characteristic and mass transport properties of HCP. However, there are relatively fewer studies investigating chloride ingress in HCP and using the ACI. In this study, the relationship between the electrical conductivity measured by the ACI and chloride ingress was investigated. Backscattered electron image analysis and mercury intrusion porosimetry and water porosity were used to measure the pore structure of HCP, and the chloride ingress depth was measured by an electron probe microanalyzer. There was a high correlation between the porosity and conductivity and between the conductivity and diffusion coefficient of the chloride ions in HCP. This implies that the diffusion coefficient of chloride ions could be estimated by the conductivity measurements.
  • KURUMISAWA KIYOFUMI
    Constr Build Mater 101 (P1) 926 - 931 0950-0618 2015/12 [Not refereed][Not invited]
  • Jamshidi Ali, Kurumisawa Kiyofumi, Nawa Toyoharu
    INFRASTRUCTURE ASSET MANAGEMENT 2 (4) 186  2053-0242 2015/12 [Refereed][Not invited]
  • Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Meor Othman Hamzah
    Journal of Cleaner Production 90 195 - 210 09596526 2015/01 [Refereed][Not invited]
     
    © 2014 Elsevier Ltd. In this study, the effects of various blast furnace slag (BFS) contents on the performance of cement pastes and pavement were investigated at two levels, the micro and the macro. At the micro level, the strength and chemical properties of cement pastes containing various percentages of BFS and subjected to different water curing periods were evaluated. At the macro level, the structural and sustainability performance of airport concrete pavements were studied. In this regard, several structural design charts were developed to determine the thickness of the concrete slab required to withstand traffic loadings for various versions of aircraft design and subgrade strengths. The sustainability of the concrete pavements was assessed in terms of fuel requirements and greenhouse gas (GHG) emissions. In addition, a simple graphical method was proposed for comparing structural and environmental performance of concrete pavements with respect to BFS content, subgrade strength, different versions of the aircraft design, fuel requirements and GHG emissions for pavement construction. Based on the results obtained using the proposed method and the structural and sustainability analyses, scenarios are suggested for choosing preliminary BFS content.
  • Kiyofumi Kurumisawa, Haruka Abe, Toyoharu Nawa
    CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structure 1046 - 1052 2015/01 [Not refereed][Not invited]
     
    The durability of the concrete structure is determined by transport properties of concrete. The transport of chloride ions greatly changes by the amount of adsorption by hydrates. However, there are few studies on change of the amount of adsorption with the calcium leaching. In this study, the purpose is to investigate a change of the amount of adsorption of the chloride ion with the calcium leaching of hardened cement pastes. The amount of chloride ion adsorption increased with the increase of the replacement ratio of the blast furnace slag. We established an equation to predict the amount of chloride ion adsorption on C-S-H and Afm. It was clarified that the amount of chloride ion adsorption on C-S-H of leached hardened cement paste depends on Ca/Si and Al/Si.
  • KURUMISAWA KIYOFUMI, MURAKAMI YUTO, ISHIGAKI KUNIHIKO, NAWA TOYOHARU
    セメント・コンクリート論文集 67 137 - 143 0916-3182 2014/02 [Not refereed][Not invited]
  • KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology Cement Science and Concrete Technology 68 (1) 171 - 177 0916-3182 2014 [Not refereed][Not invited]
     
    It is very important to evaluate the concrete durability for realizing sustainable society. The concrete durability is dependent on its transport properties. Therefore, it is necessary to measure the transport properties of concrete accurately. Nondestructive method is useful to measure transport properties of concrete. The resistivity measurement which is one of the nondestructive methods was proposed to measure the transport properties. It was reported that the resistivity and diffusion property is related. However, the resistivity(conductivity)is influenced by some factors such as aggregate content and water content of concrete. In this study, we investigated the conductivity of mortar for clarifying the effect of sand content or water to cement ratio(W/C)on the conductivity of mortar. As a result, mortar conductivity was dependent on its paste conductivity and the amount of sand. And it was possible to predict the conductivity of mortar by the proposed equation with water to cement ratio. It was shown that the effect of interfacial transition zone between sand and paste on conductivity is limited from the calculation of NIST model. It was clarified that there is good correlation between ultrasonic pulse velocity and electric conductivity of mortar. Finally, we suggested an equation to estimate the ultra-sonic pulse velocity of mortar from the conductivity.
  • K. Kurumisawa, H. Owada, M. Shibata
    Mechanics and Physics of Creep, Shrinkage, and Durability of Conrete: A Tribute to Zdenek P. Bazant - Proceedings of the 9th Int. Conf. on Creep, Shrinkage, and Durability Mechanics, CONCREEP 2013 285 - 292 2013/11 [Not refereed][Not invited]
     
    The porosity of hardened cement paste changes when it is exposed to the actual environments, and it may be expected that the chemical structure of the C-S-H undergoes changes. The C-S-H is the main component, comprising 60% or more by volume of hardened cement paste, and this study focuses on changes in the chemical structure of C-S-H. Deterioration induced by ammonium nitrate solution was accompanied by changes in the pore structure as well as structural changes in the C-S-H in the hardened cement paste. It was ascertained that when evaluating the decreases in the elastic modulus of the hardened cement paste, both the pore structure and the structure of the C-S-H must be considered. © 2013 American Society of Civil Engineers.
  • Kiyofumi Kurumisawa, Toyoharu Nawa, Hitoshi Owada, Masahito Shibata
    Cement and Concrete Research 52 190 - 195 00088846 2013/08 [Refereed][Not invited]
     
    In this report, X-ray photoelectron spectroscopy (XPS) and 29Si-MAS-NMR was used for the evaluation of deteriorated hardened cement pastes. The deterioration by ammonium nitrate solution was accompanied by changes in the pore structure as well as by structural changes in the C-S-H in the hardened cement paste. The CaO/SiO2 ratio of the C-S-H decreased with the progress of deterioration, there was also polymerization of the silicate in the C-S-H. It was confirmed that the degree of polymerization of silicate of the C-S-H in hardened cement paste can be determined by XPS. It was also shown that the polymerization depends on the structure of the C-S-H. © 2013 Elsevier Ltd.
  • KURUMISAWA Kiyofumi, MURAKAMI Yuto, ISHIGAKI Kunihiko, NAWA Toyoharu
    Cement Science and Concrete Technology セメント・コンクリート論文集 67 (1) 137 - 143 0916-3182 2013 [Not refereed][Not invited]
     
    Cement based materials such as the concrete are used as barriers of the radioactive waste disposal facilities. As for the cement based materials, the capacity for binding of the radionuclide is required in facilities, and the ability to control the leak of the nuclide to the external environment is also expected by the low diffusivity of cement based materials. The transport of radionuclide has to be controlled leakage to the external environment in the radioactive waste disposal facilities during 10,000 years. Therefore, the appropriate design of the radioactive disposal facilities is necessary, and the accurate mass transfer prediction model that considered the calcium leaching of cement based materials with the order for tens of thousands of years to evaluate it safely is necessary. In our current model, there is a difference between measurement and predicted value of chloride ion ingress as simulated a nuclide movement in the calcium leaching region of hardened cement paste. It is considered that the input parameter for the capacity for binding of the chloride ion of the hardened cement paste in calcium leaching region is not appropriate. The purpose of this study is to clarify the capacity for the binding of the hardened cement paste that calcium leaching occurred quantitatively.
    In the experiment, ammonium nitrate solution was used to accelerate calcium leaching of the hardened cement paste. The hardened cement paste with different composition by changing the immersion period was produced. The capacity for binding of the chloride ion by immersing the sample in NaCl solution was determined. In addition, the mineral composition of hardened cement paste was determined by the powder X-ray diffraction with Rietveld method, and the chemical bonding state of the silica chain of calcium silicate hydrate(C-S-H) was measured by a solid nuclear magnetic resonance device(NMR) to clarify the mechanism that quantity of chloride ion adsorption changed. The results in this study are followings. As immersion period became long, the CaO/SiO2 ratio of C-S-H in sample which immersed in ammonium nitrate solution decreased, and the capacity for chloride ion binding of leached sample also decreased. As for this reason, the decrease of the adsorption site by the polymerization of silica chains in C-S-H was suggested by the results obtained from NMR measurement, and monosulfate which was one of the hydrates in hardened cement paste was disappeared by calcium leaching. The capacity for chloride ion binding of hardened cement paste was formulated by the results of experiments, and it was able to estimate the predicted value with less than 25% of errors.
  • KURUMISAWA KIYOFUMI, NAWA TOYOHARU, OWADA HITOSHI, SHIBATA MASAHITO
    Cem Concr Res 52 190 - 195 0008-8846 2013 [Not refereed][Not invited]
  • 胡桃澤清文, 名和豊春
    コンクリート工学年次論文集(CD−ROM) 34 ROMBUNNO.1081  1347-4111 2012/06 [Not refereed][Not invited]
  • AOYAMA TAKUTO, KURUMISAWA KIYOFUMI, NAWA TOYOHARU
    セメント・コンクリート論文集 (65) 161-167  0916-3182 2012/02 [Not refereed][Not invited]
  • NAWA Toyoharu
    セメントコンクリート セメントコンクリート (779) 38 - 43 03710718 2012/01 [Not refereed][Not invited]
  • ISHIGAKI Kunihiko, KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology セメント・コンクリート論文集 66 (1) 111 - 118 0916-3182 2012 [Not refereed][Not invited]
     
    Bleeding is defined as the upward movement of water after a concrete has been placed, but it has set. It affects on the physical properties of the cured concrete. However the effect of bleeding on the microstructure has not yet been understood quantitatively. In this study, the pore structure of hardened cement paste(HCP)which was deformed by bleeding was discussed quantitatively using electron microscopy method and thermoporometry by low temperature differential scanning calorimeter(DSC). Connectivity of pore structure was also examined by the LCR meter. It is clear that bleeding increases capillary pore in the upper part of cement paste than the lower part, and has few influence on the pore which is smaller than capillary pore. In addition, a correlation was seen between the porosity and electrical conductivity of HCP regardless of bleeding. That suggests that the connectivity of the pore structure of hardened cement paste is strongly dependent on its porosity.
  • AOYAMA Takuto, KURUMISAWA Kiyofumi, NAWA Toyoharu, MURAKAMI Yuto
    Cement Science and Concrete Technology Cement Science and Concrete Technology 66 (1) 311 - 318 0916-3182 2012 [Not refereed][Not invited]
     
    It is very important to predict the deterioration of concrete that is used for a storage container of the radioactive waste. Thus it is necessary to comprehend the deterioration of cement based materials associated with calcium leaching by contact with the ground water for the super long term. We built the prediction model of diffusion in the hardened cement paste in consideration of the change in microstructure of the hardened cement paste with the Ca leaching, which is used a Nernst-Plank equation, an electro-neutral condition, and a diffusion of ions based on the Debye-Huckel equation. As a result, we can predict the transport of ions of the hardened cement paste with calcium leaching over time and the distribution of ions.
  • KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology Cement Science and Concrete Technology 66 (1) 127 - 134 0916-3182 2012 [Not refereed][Not invited]
     
    It is necessary to improve transport properties of concrete for lengthening the durability of concrete, therefore it is very important to measure the pore structure of hardened cement paste precisely in understanding mass transport properties. Measurement in electric conductivity by the AC impedance method is suggested as simple and easy technique to understand it, and the usefulness is reported in the case of hardened cement paste used with ordinary Portland cement. However, this technique has not been applied for hardened cement paste mixed with blast furnace slag that has very high resistance to chloride ingress. In this study, chloride ingress and microstructure of the blast furnace slag cement paste(BFSC)was investigated by the electric conductivity measurement. For measuring the electric conductivity the AC impedance method was applied, and backscattered electron image analysis and mercury intrusion method was used for measuring pore structure in BFSC. The relationship between porosity and the electric conductivity was expressed by the Archie's law that is expressed with exponential function, and very high correlation was shown in chloride penetration depth and electric conductivity regardless of a blast furnace slag replacement ratio.
  • Kiyofumi Kurumisawa, Toyoharu Nawa, Hitoshi Owada
    Cement and Concrete Composites Cement and Concrete Composites 34 (3) 408 - 418 0958-9465 2012/03 [Refereed][Not invited]
     
    A three-dimensional image of hardened cement paste was reconstructed using a backscattered electron image (BEI) and used to predict the diffusion properties of hardened cement paste. After the BEI observations, an autocorrelation function (ACF) was calculated for each phase of the hardened cement paste, including the unhydrated cement, portlandite, and large pores. A three-dimensional image was reconstructed on the basis of the ACF based on random distributions. The dynamic elastic modulus and diffusion coefficient were calculated using a finite-element or finite difference method with the ...
  • AOYAMA Takuto, KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology セメント・コンクリート論文集 65 (1) 161 - 167 0916-3182 2011 [Not refereed][Not invited]
     
    It is very important to predict the deterioration of concrete that is used for a storage container of the radioactive waste. So it is necessary to comprehend the deterioration of cement based materials associated with calcium leaching by contact with the ground water for the super long term. However, there are not many knowledge about the diffusion performance of deterioration of calcium silicate hydrate associated with calcium leaching. Therefore, this study focused on the degradation of calcium silicate hydrate with calcium leaching, in order to gain the knowledge of the transport properties of calcium silicate hydrate. As a result, there was the correlative relationship between porosity in calcium silicate hydrate and the diffusion coefficient of chloride ion of calcium silicate hydrate associated with calcium leaching. Also, we attempted to estimate the diffusion coefficient of chloride ion in the calcium leached hardened cement paste from plain hardened cement pastes, with the deterioration of calcium silicate hydrate and calcium hydroxide. And there was no difference between estimated value of the diffusion coefficient and measured one. Therefore, it was shown that it was important to consider the leaching of calcium hydroxide and the degradation of calcium silicate hydrate in order to predict of the transport properties of cement based materials.
  • IDE Takayuki, AOYAMA Takuto, KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology セメント・コンクリート論文集 65 (1) 464 - 469 0916-3182 2011 [Not refereed][Not invited]
     
    Recently, ultra high strength concrete(UHSC)over compressive strength of 150N/mm2 was developed. Ultra high strength concrete property is determined by its composition such as cement type, fine aggregate, coarse aggregate. Especially coarse aggregate was critical for making UHSC, because stress concentration is occurred at contact zone of aggregate and cement matrix. In this study, we applied to nonlinear voxel finite element method with three dimensional image of concrete. As a result, static elastic modulus and compressive strength was able to predict by this method within 10% in error. Moreover, it was shown that the fracture strength of coarse aggregate, and the difference between the elastic modulus of mortar matrix and coarse aggregate is very important to achieve the ultra high strength of concrete.
  • SUSTAINABLE DEVELOPMENT IN CONSTRUCTION
    Nawa Toyoharu, Kurumisawa Kiyofumi
    ADVANCES IN CONCRETE STRUCTURAL DURABILITY: PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON DURABILITY OF CONCRETE STRUCTURES ICDCS2010 211 - 217 2010 [Refereed][Not invited]
  • AOYAMA Takuto, KURUMISAWA Kiyofumi, NAWA Toyoharu, OWADA Hitoshi
    Cement Science and Concrete Technology セメント・コンクリート論文集 64 (1) 66 - 73 0916-3182 2010 [Not refereed][Not invited]
     
    Transport characteristic of cement based materials is close to pore structure. To evaluate transport characteristic of cement based materials which have been used for super-long term, the microstructure of cement based materials will be metamorphosed by exterior environment, so it is necessary to consider the microstructure of cement based materials. However, many prediction models of transport characteristic focus only on pore structure, there are few prediction models of transport characteristic that consider the spatial distribution of C-S-H, portlandite, and pore. Therefore, this study focuses on the spatial distribution of each phase of cement based materials. From the 2-D backscattered electron image, the auto-correlation function of each phase of cement based materials is calculated, and the 3-D spatial image of cement based materials is estimated by using the auto-correlation functions. We attempt to estimate diffusion coefficient of chloride ion from the 3-D spatial image. Estimated value of the diffusion coefficient of chloride ion from the 3-D spatial image is as half as the experimental value. And we attempt to estimate diffusion coefficient of the deteriorated sample from 3-D spatial image of normal sample. There is a difference within 10 times between the estimated value from the 3-D spatial image of the normal sample and the experimental value of the deteriorated artificially sample.
  • FUKUSHIMA Koki, ISHIMORI Masatoshi, KURUMISAWA Kiyofumi, NAWA Toyoharu
    Cement Science and Concrete Technology Cement Science and Concrete Technology 64 (1) 74 - 81 0916-3182 2010 [Not refereed][Not invited]
     
    Dry and wet cycle experiment was carried out on hardened cement paste to understand the drying shrinkage mechanism and the effect of Shrinkage Reducing Agent(SRA)on the pore size distribution determined by Low Temperature Thermo Porosimetry(LT-DSC). In the specimen without SRA which was held at 20 degrees Celsius and relative humidity of 40%, the volume of Small Gel Pore(1.0 to 2.2 nm in radius)was reduced but it did not recover after dry and wet cycle experiment, while the volume of Large Gel Pore(2.2 to 6.0 nm in radius)did not change. Therefore, it could be clear that at this condition the main factor of the shrinkage and expansion was aggregation and dispersion of the C-S-H unit. On the other hand, in the specimen without SRA which was held at 40 degrees Celsius and relative humidity of 40%, the volume of C-S-H Gel Pore(1.0 to 6.0 nm in radius)was reduced but it did not recover after dry and wet cycle experiment, the pore structure became coarse and the volume of capillary pore increased. Thus, it could be clear that at this condition, the main factor of the shrinkage and expansion was aggregation and dispersion of the cluster of C-S-H. In contrast, in the specimen with SRA, the pore size distribution did not change after dry and wet cycle experiment. Therefore, it could be clear that SRA retain the C-S-H Gel Pore which contributes the shrinkage and expansion to reduce strain after dry and wet cycle experiment.
  • KAWAKAMI Hiroyuki, NAWA Toyoharu, KURUMISAWA Kiyofumi, MINATO Daisuke
    Cement Science and Concrete Technology セメント・コンクリート論文集 63 (1) 35 - 42 0916-3182 2009 [Not refereed][Not invited]
     
    It has been recognized that the hydration behavior of Belite depends on the amount of Alite being coexistence with Belite, the curing temperature and the ionic concentration of leached calcium in pore solution. To understand these crucial factors on the hydration behavior of Belite, X-ray diffraction(XRD)and Rietveld analysis are carried out to quantify the hydration degree of Alite, Belite, and other cement hydrates. From the result obtained in this study, it is found that the amount of Alite has an influence on the hydration behavior of Belite;hydration degree of Belite decreases with increase in the amount of Alite. Furthermore, curing temperature(less than 50℃)does not have an affect the hydration behavior of α dicalcium silicate(α-C2S)but the hydration behavior of β dicalcium silicate(β-C2S)has temperature dependency. At high water to cement ratio of 10,000 percent, the ionic concentration of calcium in pore solution remains very low, and it brings about that the hydration degree of Alite stops at around 80% and the induction period is disappeared;however, there is no significant different on the hydration behavior of β-C2S from that at water to cement ratio of 50%. Therefore it might be concluded that the hydration behavior of β-C2S is not affected by the ionic concentration of calcium in pore solution.
  • KURUMISAWA Kiyofumi, NAWA Toyoharu
    J. Struct. Constr. Eng. J. Struct. Constr. Eng. 74 (642) 1405 - 1411 1340-4202 2009 [Not refereed][Not invited]
     
    For achievement of long-term durability of concrete structures, it is important to get knowledge about properties of concrete. Nowadays, properties of concrete are determined by experimental or predicting from empirical equation. However, it is difficult to predict concrete properties at long-term, because it is impossible to do experiment. Therefore, it is necessary to make a model by considering its microstructure. Microstructure is a key for predicting the properties of concrete. Some properties are determined by microstructure such as C-S-H, calcium hydroxide, pores, unhydrated cement particles, interfacial transition zone and these interactions. In this study, we investigated dynamic elastic modulus of hardened cement pastes in view point from microstructure. Backscattered electron image was used for acquiring the microstructure image and autocorrelation function (ACF) of each phase was calculated by these images. The ACF was applied for reconstructing three dimensional structures from two dimensional images. Finally, three dimensional structures were used for calculating dynamic elastic modulus of specimen. It was cleared that the prediction result of dynamic elastic modulus used micro indentation result was good agreement with experimental result in high W/C.
  • Journal of structural and construction engineering. Transactions of AIJ Journal of structural and construction engineering. Transactions of AIJ 74 (642) 1405 - 1411 13404202 2009 [Not refereed][Not invited]
  • KURUMISAWA Kiyofumi
    セメントコンクリート セメントコンクリート (741) 56 - 59 03710718 2008/11 [Not refereed][Not invited]
  • KURUMISAWA Kiyofumi, NAWA Toyoharu, NARA Yoshitaka
    Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 30 (1) 591 - 596 13477560 2008/07 [Not refereed][Not invited]
  • ELAKNESWARAN Yogarajah,NAWA Toyoharu,KURUMISAWA Kiyofumi,HAYASHI Ami
    セメント・コンクリート論文集 (61) 108 - 114 0916-3182 2008/02 [Not refereed][Not invited]
  • Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 30 (1) 591 - 596 13477560 2008 [Not refereed][Not invited]
  • ELAKNESWARAN Yogarajah,NAWA Toyoharu,KURUMISAWA Kiyofumi,FUSHIMI Koji
    セメント・コンクリート論文集 (60) 111 - 117 0916-3182 2007/02 [Not refereed][Not invited]
  • Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 29 (1) 63 - 68 13477560 2007 [Not refereed][Not invited]
  • Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 29 (1) 819 - 824 13477560 2007 [Not refereed][Not invited]
  • TERMKHAJORNKIT Pipat,NAWA Toyoharu,KURUMISAWA Kiyofumi
    Cem Concr Compos 28 (9) 781 - 789 0958-9465 2006/10 [Refereed][Not invited]
  • YAMASHIRO Yoichi, SAITO Toshiki, NAWA Toyoharu, KURUMISAWA Kiyofumi
    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction 2006 (0) 271 - 272 13414437 2006/07 [Not refereed][Not invited]
  • NAWA T., KURUMISAWA K.
    コンクリート工学 = Concrete journal コンクリート工学 = Concrete journal 44 (5) 31 - 34 03871061 2006/05 [Not refereed][Not invited]
  • KURUMISAWA Kiyofumi,TANAKA Kyoji
    Cem Concr Res 36 (2) 330 - 336 0008-8846 2006/02 [Not refereed][Not invited]
  • Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 28 (1) 1871 - 1876 13477560 2006 [Not refereed][Not invited]
  • KURUMISAWA Kiyofumi, TERMKHAJORNKIT Pipat, NAWA Toyoharu
    Journal of structural and construction engineering. Transactions of AIJ Journal of structural and construction engineering. Transactions of AIJ 0 (603) 1 - 8 13404202 2006 [Not refereed][Not invited]
     
    Recently, the amount of the exhaust of fly ash increases by increasing thermal power plant. Using it as a concrete mixture material is an effective method for decreasing waste. However, the influence on the hydration of the cement and reaction rate of fly ash is not examined in detail. Then, the cement paste that mixed fly ash examined it by Backscattered Electron image and element image measured by Energy Dispersive X-ray analysis in this research. As a result, reaction rate of fly ash and distribution of fly ash and cement in the fly ash-cement pastes were clarified. And the amount of com...
  • KURUMISAWA Kiyofumi, TERMKHAJORNKIT Pipat, NAWA Toyoharu
    Journal of structural and construction engineering. Transactions of AIJ Journal of structural and construction engineering. Transactions of AIJ 0 (603) 9 - 16 13404202 2006 [Not refereed][Not invited]
     
    The elastic properties of concrete depend on the characteristic of cement matrix and coarse aggregates. The elastic characteristic of cement matrix depends on the cement paste when the properties of the fine aggregate are constant. That is, clarifying the characteristic of the cement matrix clarifies the elastic properties of concrete. Therefore, the technique for predicting the elastic modulus of the cement paste from the viewpoint of microstructure was examined in this research. It classified into four phases (pore, C-S-H, calcium hydroxide, and unhydrated cement) in the backscattered ele...
  • KURUMISAWA Kiyofumi, NAWA Toyoharu
    Journal of structural and construction engineering. Transactions of AIJ Journal of structural and construction engineering. Transactions of AIJ 0 (595) 9 - 15 13404202 2005/09 [Not refereed][Not invited]
     
    The durability of concrete is greatly influenced by the physical properties of the hardened cement paste. The physical properties of hardened cement paste are dependent on the degree of hydration and porosity of hardened cement paste. Therefore, it is important to measure the degree of hydration and porosity of hardened cement paste correctly. Measuring them, some methods are proposed, XRD, point counting or TG/DTA as example. Then, in this research, with Backscatter electron image (BEI) and Energy dispersive X-ray analysis (EDX), the degree of hydration and porosity of hardened cement past...
  • TERMKHAJORNKIT Pipat, NAWA Toyoharu, KURUMISAWA Kiyofumi
    Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 27 (1) 169 - 174 13477560 2005/06 [Not refereed][Not invited]
  • TERMKHAJORNKIT PIPAT, NAWA TOYOHARU, KURUMISAWA KIYOFUMI
    コンクリート工学年次論文集 27 (1) 169 - 174 1347-7560 2005/06 [Not refereed][Not invited]
  • PIPAT T.
    Proceedings of the Japan Concrete Institute Proceedings of the Japan Concrete Institute 27 (1) 169 - 174 13477560 2005 [Not refereed][Not invited]
  • KURUMISAWA Kiyofumi, TANAKA Kyoji
    Journal of structural and construction engineering. Transactions of AIJ Journal of structural and construction engineering. Transactions of AIJ 0 (584) 23 - 28 13404202 2004 [Not refereed][Not invited]
     
    It is well known that most of property of concrete is influenced by its pore structure. ln particularly permeability of concrete is dependent on its pore structure. Therefore, it is beneficial to know durability of concrete that pore structure is measured exactly. We already developed the technique to make clear the pore structure in hardened cement paste by gallium intrusion and the following EPMA observation. In this research, using a image acauired by EPMA estimates diffusion coefficient with random walk which is many particles are walking in pore structure with random. The permeability ...
  • KURUMISAWA Kiyofumi, TANAKA Kyoji
    Journal of structural and construction engineering. Transactions of AIJ Journal of structural and construction engineering. Transactions of AIJ 0 (556) 9 - 14 13404202 2002/06 [Not refereed][Not invited]
     
    It is widely known that the property of concrete is influenced by its pore structure, particularly permeability of concrete is directly dependent on it. We have already developed the technique to make clear the pore structure in hardened cement paste by applying gallium intrusion technique and the following EPMA observation. However, this method has only limited to 2 dimensional analysis. We improve the technique to 3 dimensional analysis of pores by stacking up 75 sheets of 2-D pore image pictures. In this paper, 3-D pore image is made up and pore distribution, shape and continuity of vari...

Conference Activities & Talks

MISC

Research Grants & Projects

  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(若手研究(B))
    Date (from‐to) : 2011 -2012 
    Author : Kiyofumi KURUMISAWA
     
    北海道大学The purpose of this study is to predict the transport of ion in the hardened cement paste that calcium leaching occurred quantitatively. Furthermore, the mass transfer prediction model was improved by incorporating the phase equilibrium of solid-liquid interaction and3-dimensional spatial image model. As a result, it is possible to predict the transport of ion by the proposed prediction model. The AC impedance method that is simple and non-destructive measurement was applied to measure the transport properties of hardened cement paste, it is clarified that the relationship between the measured conductivity by AC impedance and diffusion coefficient of hardened cement paste was in good agreement.
  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(若手研究(B))
    Date (from‐to) : 2009 -2010 
    Author : Kiyofumi KURUMISAWA
     
    北海道大学The section of the hardened cement paste was observed by a backscattered electron image to predict the properties of cementitious materials with mineral admixtures and quantified its microstructure by an autocorrelation function with the quantity of each phase. A three-dimensional image model was built by the supposition that each phase was distributed in the three-dimensional space in isotropic homogeneity based on them at random. Diffusion performance and mechanical properties of the hardened cement paste with this three-dimensional image model was calculated. As a result, about the diffusion performance, it was able to predict diffusivity of the hardened cement paste by using the value that it was based on a study in the past from the value that measured diffusivity of hydrates by micro-indentation method and estimated. In addition, the elastic modulus of hydrates was estimated from a stress-strain curve of the hardened cement paste reversely and it was shown that elastic modulus of hydrates is a function of the porosity and clarified that fracture criterion of hydrates was about 1,000μ regardless of curing age and the water cement ratio.
  • Modelling of porous media
    Date (from‐to) : 2008

Educational Activities

Teaching Experience

  • Advanced Information Processing for Resources Engineering
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : 化学反応 無機材料 モデリング 多孔体材料 数値解析 微分方程式
  • Sustainable engineering materials
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 工学院
  • Advanced Information Processing for Resources Engineering
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : 化学反応 無機材料 モデリング 多孔体材料 数値解析 微分方程式
  • Advanced Information Processing for Resources Engineering
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : 化学反応 無機材料 モデリング 多孔体材料 数値解析 微分方程式
  • Sustainable engineering materials
    開講年度 : 2017
    課程区分 : 博士後期課程
    開講学部 : 工学院
  • Advanced Information Processing for Resources Engineering
    開講年度 : 2017
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : 化学反応 無機材料 モデリング 多孔体材料 数値解析 微分方程式
  • Applied Mathematics I
    開講年度 : 2017
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 常微分方程式 ラプラス変換 フーリエ解析 偏微分方程式
  • Numerical Computation
    開講年度 : 2017
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 2進数,誤差,反復法,ニュートン法,非線形方程式,連立方程式、ガウスの消去法,LU分解,反復法,ヤコビ法,ラグランジュ補間,台形公式,オイラー法,ルンゲ・クッタ法, 微分方程式,偏微分方程式
  • Exercise in Thermodynamics
    開講年度 : 2017
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : ガスサイクル、蒸気の性質、気液二相サイクル、熱移動
  • Thermodynamics
    開講年度 : 2017
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 熱、仕事、第一法則、第二法則、エントロピー、理想気体、熱機関、相平衡、化学平衡
  • Experiments for Sustainable Resources Engineering Ⅰ
    開講年度 : 2017
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 基本操作、物理計測、化学分析


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